User Photo/Company Logo:
This image is used as your logo in emails, receipts, your embedded checkout and on your enhanced Outdoorsy Profile.
This is the primary background image displayed on your profile and checkout pages
The sizes for the company logo/user photo & the cover photo are as follows:
Company Logo: 500 x 500
Cover Photo: 300 x 1400
Those can be changed in Account Settings > About My Business
The optimal size for listing photos (photos of the RV) is: 1024 X 800
Listing Photo: 1024 x 800
Pro tip: Photos including "happy campers" are proven to increase conversion!
Disclaimer: Make sure to respect the local laws surrounding photo privacy.